1. How will it be when passengers are boarding smaller aircrafts like the Q400 or Saab 340? will they use the doorstairs on the plane? or just vanish near the aircraft?

They will use the airplane stairs, of course.

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2.Is it possible that passenger can walk out\in from the terminal at a chosen spot when not at a gate? or is it only they will arrive with bus? Im thinking if it is a small airport its not realy realistic they will appear in a bus when the aircraft is parked close to the terminalbuilidng.

GSX always had the ability to turn off the Passenger bus in the parking customization page, to cover these cases.

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3.How many different passenger models will it be in the release pack?

We'll know for sure on release day. The version we demonstrated at the Flightsimexpo had 2 pilots, 3 flight attendants and 25 different passenger models, but this will surely increase before the release day.

Of course it will. Everything you add to the sim affects VAS. Which is why we strongly suggest using P3D4, even if the expansion will still work with FSX or P3D1-2-3 but, when used together with a complex airport and a complex airplane, where VAS is already a problem, you'll get very close to OOM crashes.

Will it be possible to configure SODE-Jetways on a 3rd party airport and share such files in your download section? Since those files doesn’t seem to content material of the 3rd party add ins this should be legal I guess.

I was wondering if its possible to add a "Aircraft Repositioning" feature (i.e. moving from one gate to another or moving to/from remote positions / maintenance to gates) and to "turn on / off" specific vehicles on turnarounds without having to modify the aircraft's configuration.

The gate-to-gate pushback feature has been asked and answered so many times and yes, it's planned for a future update to the core GSX program, which means it will be free so, it's not something related to this expansion.

The gate-to-gate pushback feature has been asked and answered so many times and yes, it's planned for a future update to the core GSX program, which means it will be free so, it's not something related to this expansion.

Interesting. Does this include the ability to simulate towing an aircraft? For instance, from Maintenance to a gate or similar?Or is that not something which is gonna be a part of GSX?

You mentioned that "...you'll be able to remove static jetways too, as long as they were modeled as a separate object.". Can you shed some light on how this will be done or is it too early and we should wait until the release?